Introduce WorkerStoragePartitionId and use it in SharedWorkerInstance.

content/browser/worker_host/worker_storage_partition.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WORKER_HOST_WORKER_STORAGE_PARTITION_H_
 #define CONTENT_BROWSER_WORKER_HOST_WORKER_STORAGE_PARTITION_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 
@@ skipping 89 matching lines @@
   scoped_refptr<net::URLRequestContextGetter> url_request_context_;
   scoped_refptr<net::URLRequestContextGetter> media_url_request_context_;
   scoped_refptr<ChromeAppCacheService> appcache_service_;
   scoped_refptr<quota::QuotaManager> quota_manager_;
   scoped_refptr<fileapi::FileSystemContext> filesystem_context_;
   scoped_refptr<webkit_database::DatabaseTracker> database_tracker_;
   scoped_refptr<IndexedDBContextImpl> indexed_db_context_;
   scoped_refptr<ServiceWorkerContextWrapper> service_worker_context_;
 };
 
+// WorkerStoragePartitionId can be used to identify each
+// WorkerStoragePartitions. We can hold WorkerStoragePartitionId without
+// extending the lifetime of all objects in the WorkerStoragePartition.
+// That means that holding a WorkerStoragePartitionId doesn't mean the
+// corresponding partition and its members are kept alive.
+class CONTENT_EXPORT WorkerStoragePartitionId {
+ public:
+  explicit WorkerStoragePartitionId(const WorkerStoragePartition& partition);
+  ~WorkerStoragePartitionId();
+  bool Equals(const WorkerStoragePartitionId& other) const;
+
+ private:
+  net::URLRequestContextGetter* url_request_context_;
+  net::URLRequestContextGetter* media_url_request_context_;
+  ChromeAppCacheService* appcache_service_;
+  quota::QuotaManager* quota_manager_;
+  fileapi::FileSystemContext* filesystem_context_;
+  webkit_database::DatabaseTracker* database_tracker_;
+  IndexedDBContextImpl* indexed_db_context_;
+  ServiceWorkerContextWrapper* service_worker_context_;
+};
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WORKER_HOST_WORKER_STORAGE_PARTITION_H_